Die head



DIE HEAD Nw 111| in l w QN,

V. R. KOONTZ May 29, 1923.

Filed June 9, 1921 May 29, 1923. 1,456,805

` v. R. KooNTz DIE HEAD v Filed'June 9. 1921 4 shee'tsl-sheet g El?? Z291 O 56 May 29, 1923. l 1,456,805

y v. R. KooNTz I DIE HEAD Filed June 9, 1921 4 Sheets-Sheet 3 Lum May 29, 1923. 1,456,805'V V. R. KOONTZ v DIE HEAD e Filed'June, 9. 1921 4 sheets-sheet 4 Patented Ma; 29,1923.

UNiTEu STATES PATENT OFFICE.

VICTOR R. KOONTZ, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR TO THE VICTOR TOOL COMPANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

DIE HEAD.

Application led .Tune 9,

To all whom. it may concern.'

Be it known that I, VIUroa R. KooN'rz, a citizen of the United States, residing at IVaynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Die Heads, of which the following is a specification.

The present invention relates to threading dies, the object being to provide a die of the self-opening or expanding type that will automatically free itself from the work when a predetermined amount of thread has been cut thereon and thus permit the removal of the die without the neceity of unthreading it.

A further and important object is to pro- `vide novel means whereby the chasers or cutting elements can be quickly and easily adjusted to operate on work of different diameters.

In the accompanying drawings Figure 1 is a side elevation of one embodiment of the invention, Figure 2 is a sectional view on the line 2-2 of Figure 1,

Figure 3 is a sectional view on the line 3 3 of Figure 2,

Figure 4 is an end elevation of the tool,

Figures 5 and 6 are cross sectional views taken respectively on the line 5-5 and 6-6 of Figure 3,

Figure 7 is a cross sectional view taken on the line 7-7 of Figure 1,

Figure 8 is a detail view similar to Figure 1. but with portions broken away toillustrate the coacting parts,

Figure 9 is a detail perspective view of one of the chasers,

Figure 10 is a View in elevation of a modified form of construction,

Figure 11 is a longitudinal sectional view therethrough and showing the internal parts in elevation.

Figure 12 is a view similar to Figure 11, but illustrating the relation of the parts when the chasers are in their outermost positions.

Figure 13 is a longitudinal section view on the line 13.-13 of Figure 10,

Figure 14 is an end elevation of the head,

Figure 15 is a detail sectional view similar to Figure 13, but illustratlng the relation 1921.` serial No. 476,277.

of the parts when the chasers are in their inactive positions,

Figures 16 and 17 are cro sectional views on the lines 16-16 and 17-17 respectively of Figure 13,

Figure 18 is a cross sectional view on the line 18-18 of Figure 11,

Figure 19 is a cross sectional view on the line 19-19 of Figure 12.

In the embodiment illustrated in Figures 1-9 inclusive, a stock 2O is employed having a hollow stem portion 21provided with an enlarged head 22. This head 22 is slotted to receive a plurality of radially Slidable chasers 23 having inclined outer ends 24 provided with grooves 25. A` retaining plate 26 se'rves to hold the chasers in place.

A collar 27 is longitudinally slidable on the head 22 and is provided with internal inclined ways 28 that receive theinclined outer ends 24 of the chasers 23. These ways are provided with ribs 29 that engage in the grooves 25. It will be obvious that upon the outward movement of the collar 27 the chasers will he moved inwardly and upon the rearward movement of the collar 27 the chasers will be correspondingly moved outwardly. Another collar 30 is longitudinally slidable on the stem portion 21, and has a reduced portion 31 that overlaps the collar 27, said collar 27 being cut-away to receive said portion 31, and said collar 30 being also cut away to receive the collar 27. The two collars 27 and 30 are adjustably connected by a nut or sleeve 32 that is oppositely threaded thereon, and is preferably provided with a knurled or roughened peripheral surface. The vcollar 30 has its greater portion spaced from the stem 21 of the stock 20, its rear end being provided with an internal flange 33 that slides upon said stem. This flange constitutes an abutment for a coiled spring 34 housed within the collar 30 and also bearing against the rear end of the head 22. The actlon of the spring 34 is to move the collar 30, and through its connection with the collar 27, also move said collar rearwardly to thus slide the chasers outwardly.

A holding collar 35 is rotatably mounted on lthe rear portion of the stem 21, being abutted against a stop nut 36 threaded on the stock. This collar is provided with diametrically opposite forwardly projecting lugs 37 that are adapted to be borne against.

by the rear end of the collar 30 to thus hold said collar and the elements associated therewith in their forward positions.' The collar 30 is, however, providedin its rear end with sockets 38 that are adapted to receive the lugs 37 when the collar 35 is in a predetermined position. The collar 35 is provided with a transverse slot 39 forming a seat for a coiled spring 40, one end of which bears against the end of the slot, the other end bearing against a pin or screw 41 engaged in the stem 21 and projecting into the other end of the slot 39. The collar is preferably covered with a casin 42 that serves to retain the spring40 in p ace.

Longitudinally slidable in the hollow stem 21 is a plunger head 43, and adjustably projecting from the front end thereof, is an abutment screw 44 that is adapted to be held in any desired position by a set screw 45. This plunger head 43 carries a cross pin 46 that projects through slots 47 in the opposite sides of the stem 21 and has its terminals engaged in diagonal slots 48 formed in the rear end of the holding collar 35.

The operation of this embodiment of the invention is substantially as follows: To set the chasers in their innermost or active positions, it is only necessary to move the collars 27, 30 and 32 forwardly. These three elements in e'ect constitute the actuating member for the chasers. When said member is thus moved forwardly, the lugs 37 of the collar 35 are disengaged from the sockets 38 and the spring 40 acts to turn said holding collar to a position with the lugs 37 at one side of the sockets 38, as indicated in Figure 8. The parts are then in the position illustrated in Figure 3 and the tool is now ready for action. If, therefore, a rod or other article to be threaded is introduced into the open end of said tool, it will be'evident that the chasers will cut threads thereon until the article engages the abutment screw 44 and moves it rearwardly a sufficient distance to cause the cross pin 46 to turn the holding collar 35 to a position where the lugs 37 aline with the sockets 38. When this takes place, the actuating member is freed and the spring 34, which was compressed by the forward movement of said member, will react to force the member rearwardly. This will cause the outward radial movements of the chasers a sufficient distance to release the work and permit it to be withdrawn from the head. g

In the embodiment illustrated in Figures 10-19 inclusive, the stock is designated 49 and in which there is a tubular stem 50, which in this instance is slidable with respecty to the main body of the stock, but is held against rotation therein by keys 51. `The stem 50 is provided with a front head 52 in which the radial cutters 53 are slidably mounted. A collar 54, slidable upon the head 52, is engaged with the outer ends of the cutters to move the same and is connected to a rear collar 55 by an adjustable nut 56 threaded on both. A rotatable holding collar 57, mounted on the stem 50, is rovided with lugs 58 adapted to enter soclliets 59 formed in the collar 55 when the collar 57 is in a predetermined osition, as illustrated in Figure 12, or said ugs can be located at one side of the sockets 59 as indicated in Figure 11. A coiled spring 60, surrounding the stem, operates against the collar 55 to urge it rearwardly.

The stock 49 is provided with a housing portion 61 that surrounds the holding collar 57 and overlaps the collar 55. This housing is provided with an 4enlarged opening 62V through which pro'ects a handle 63 carried by the holding col ar 57 and by means of which said collar may be rotated. The collar is held in place by a nut 64 threaded on the stem 50. The housing furthermore is provided with a pair of diametrically opposite screws 65, which as shown particularly in Figures 11, 12 and 19, have portions 66 engaged in inclined grooves 67 formed in the holding collar 57. The grooves 67 communicating with transverse extensions 68.

With this structure, to set the chasers in their operative positions, it is only necessary to turn the collar 57 in one direction by means of the handle 63. This will force the f actuating member forwardly since the lugs 58 have inclined faces. As a consequence the chasers are moved inwardly and the spring 60 is compressed. With this type of device, both the tool and the work are held against longitudinal movement and it will therefore be evident that as the threading'action takes place the stem 50 will be moved longitudinally outward, while the stock body 49 is held against such movement. As a consequence the inner ends 66 of the screws 65 riding in the inclined portions 67 of the slots in the holding collar 57 will cause said collar to rotate and thus bring the lugs 58 into register with their sockets 59. When this takes place, the spring-60 will react to move the actuating member rearwardly, thereby moving outwardly the chasers.

Both embodiments of the invention dis.- closed are relatively simple and are positive in action. After an operation they can be quickly returned to active condition, and moreover the chasers can be easily, quickly and accurately adjusted by turning the adjusting nuts 32 and 56 respectively.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art. without further description, and it will be understood that various changes in the size,

y stock for holding the actuating member in a predetermined position, and means carried by the stock and actuated by the, work for causing the automatic rotation of the collar to release the actuating member.

2. In a threading tool, the combination with a stock and cutters movably mounted thereon, of a cutter actuating member surrounding and longitudinally movable on the stock,. a spring for moving the actuating member in one direction, a collar rotatably surrounding the stock in rear of the actuating member for holding it in a predetermined position and against movement by the spring, and means carried by the stock and actuated by the work for causing the automatic rotation of the collar to release the actuating member, and permit its movement by the spring.

3. In a threading tool, the combmatlon with a stock and cutters movably mounted thereon, of a cutter 'actuating member surrounding and longitudinally movable on the stock, a holding member for the actuating member rotatably surrounding the stock in rear of the actuating member, one of. sald members having a socket, the other havlng a projection adapted to enter the socket or abut againstthe first member at one side of the socket accordingly as the holding member is turned, a spring acting against the actuating member to cause its movement when the projection alines with the socket, and means for automatically turning the holding colla-r member.

4. In a threading tool, the combination with a stock, of a plurality of cutters radially slidable in the outer end thereof and having inclined bearing portions, a tubular actuating member slidable longitudinally on the stock, and having inclined ways for the bearing portions and also having a socket in its rear end, a coiled spring within the actuating member and bearing against the same to urge it rearwardly, a rotary holding collar in rear of the actuating member and provided with a forwardly extending lug adapted to enter the recess and to abut against the member at one side of said recess, and means operated by the work being threaded, for automatically turning the holding collar.

5. In a threading tool, the combination with a stock and cutters movably mounted thereon, of a cutter factuating member longitudinally movable on the stock, a device rotatable on the stock for holding the actuating member in a predetermined position, a headl slidably mounted in the stock, an abutment member adapted to be engaged by the Work and adjustably mounted on the head, and means moved by the head for turning the holding device.

7. In a threading tool, the combination with a stock, of a. plurality of cutters radially slidable in the outer end thereof and having inclined bearing portions, a tubular actuating member slidable longitudinally on the stock, and having inclined ways for the bearing portions. and also having a socket'in its rear end, a coiled spring within the actuating member and bearing against the same to urge it rearwardly, a rotary holding collar in rear of the actuating member and provided with a forwardly extending lug adapted to enter the recess and to abut against the member at one side of said recess, a head slidable in the stock, a cross pin on the head, an inclined way on the collar in which the cross pin engages, and an adjustable abutment on the head located in the path of the Work operated on by the cutters.

8. In a threading tool, the combination with a stock and a cutter movable in and out on the same` of an actuating member for the cutter movable on the stock, and a holding member to maintain the actuating member in a predetermined position, said actuating member comprising an element engaged with the cutter, an element engaged with the holding member, and a sleeve surrounding the stock and adjustably threaded to both elements for relatively adjusting the said elements and holding them in different adjusted relations.

9. In a threading tool, the combination with a stock and a cutter movable in and out on the same, of an actuating member for the cutter movable on the stock, and a holding member to maintain the actuating member in a predetermined position, said actuating member comprising a collar engaged with the cutter, a collar engaged with the holding member, and a nut connecting the collars for relatively adjusting the same and holding them in different adjusted relations.

10. In a threading tool, the combination with a stock and cutters movably mounted thereon, of a cutter actuating member longitudinally movable on the stock, a holding member for the actuating member rotatable on the stock, one of said members having a socket, the other having a projection adapted to enter the socket or abut against the rst member at one side of the socket accordingly as the holding member is turned, a spring acting against the actuating member to cause its movement when the projection alines with the socket` and means for automatically turning the holding member, said actuating member comprising spaced collars, one of which engages the cutters, the other being abutted against the holding member, and a coupling sleeve adjustably threaded on both to hold them different distances apart.

11. In a threading tool, the combination with a stock, of a plurality of cutters radially slidable in the outer end thereof and having inclined bearing portions, a collar rearwardly, a holding collar rotatable on the stockand having a lug adapted to enter the socket of the rear collar and to be abutted against by said collar, and means for rotating the holding collar.

In testimony whereof, I afi-lx my signature in the presence of two witnesses.

. VICTOR R. KOONTZ.

Witnesses R. G. MUMMA. M. V. HENNEBERGER. 

